package com.cloudfunx.common.util;

import org.springframework.beans.BeansException;
import org.springframework.beans.FatalBeanException;
import org.springframework.util.Assert;

import java.beans.PropertyDescriptor;
import java.lang.reflect.Method;
import java.lang.reflect.Modifier;

public class BeanUtils extends org.springframework.beans.BeanUtils {
 
  public static void copyProperties(Object source, Object target) throws BeansException {
    // source为空时，什么都不干
    if (source == null){
      return;
    }
    Assert.notNull(target, "Target must not be null");
    Class<?> actualEditable = target.getClass();
    PropertyDescriptor[] targetPds = getPropertyDescriptors(actualEditable);
    for (PropertyDescriptor targetPd : targetPds) {
      if (targetPd.getWriteMethod() != null) {
        PropertyDescriptor sourcePd = getPropertyDescriptor(source.getClass(), targetPd.getName());
        if (sourcePd != null && sourcePd.getReadMethod() != null) {
          try {
            Method readMethod = sourcePd.getReadMethod();
            if (!Modifier.isPublic(readMethod.getDeclaringClass().getModifiers())) {
              readMethod.setAccessible(true);
            }
            Object value = readMethod.invoke(source);
            // 这里判断以下value是否为空 当然这里也能进行一些特殊要求的处理 例如绑定时格式转换等等
            if (value != null) {
              Method writeMethod = targetPd.getWriteMethod();
              if (!Modifier.isPublic(writeMethod.getDeclaringClass().getModifiers())) {
                writeMethod.setAccessible(true);
              }
              writeMethod.invoke(target, value);
            }
          } catch (Throwable ex) {
            throw new FatalBeanException("Could not copy properties from source to target", ex);
          }
        }
      }
    }
  }
}